package com.example.listview;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;



import java.util.List;

/**
 * Created by Administrator on 2017/4/4.
 */

public class FruitAdapter extends ArrayAdapter<Fruit> {
    private int resourceId;
    public FruitAdapter (Context context , int textViewResourceId, List<Fruit> objects ){

        super(context , textViewResourceId ,objects);
        resourceId = textViewResourceId;

    }
    @Override
    public View getView(int position , View convertView , ViewGroup parent ) {
        Fruit fruit = getItem(position); //获取当前项的Fruit实例
        View view;
     ViewHolder viewHolder;
        if (convertView == null) {
            view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
            viewHolder.fruitName = (TextView) view.findViewById(R.id.fruit_name);
            view.setTag(viewHolder);  //将ViewHolder存储于View中
        }else{
            view =convertView;
            viewHolder = (ViewHolder)view.getTag();//重新获取ViewHolder
        }
        viewHolder.fruitImage.setImageResource(fruit.getImageId());
        viewHolder.fruitName.setText(fruit.getName());
        return view;
    }
    class ViewHolder{
        ImageView fruitImage;
        TextView fruitName;
    }
}
